T-rex Teabag

Buses are designed to carry a lot more people than the number of seat they have since they allow for standing. Adding cubes would take away that standing space.

Good idea but you lose a huge amount of capacity with the cubes. It would still be magnitudes more efficient than a car per person though.

Wait, rich people are doing that already? Seriously?

Isopropanol expires? I had no idea! lol. I guess moisture getting into the solution could impact the concentration?